A digital image watermarking algorithm based on discrete wavelet transform and Discrete Cosine Transform
A digital image watermarking algorithm based on discrete wavelet transform and Discrete Cosine Transform
复制标题
基于离散小波变换和离散余弦变换的数字图像水印算法
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
Yanhong Cai
中科院分区：
文献类型：
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作者：
Qianli Yang;Yanhong Cai
数字水印技术是版权保护的有效手段之一。为了有效地保护数字媒体的版权，提出了一种基于二维离散小波和余弦变换的灰度图像数字水印算法。将图像进行三次离散小波域变换，将图像分成水平方向较低、垂直方向较高的子块，然后将每个子块变换到离散余弦域，将水印分量也变换到离散余弦域，然后将水印分量嵌入到封面图像中。最后，通过小波域和余弦域的逆变换得到秘密图像。实验结果表明，该水印对常用的JPEG压缩、噪声、低通滤波和剪切等信号处理技术具有较强的鲁棒性。
The technique of digital watermarking is one of the valid methods for copyright protection. In this paper, we propose a digital watermarking algorithm with gray image based on 2 dimensions discrete wavelet and cosine transform in order to protect digital media copyright efficiently. We transform the image into discrete wavelet domain for three timely and split the image into sub-blocks, which is lower in horizontal direction and high in vertical direction, and then transform every block into discrete cosine domain, the watermarking components, which is also transformed into discrete cosine domain, are embedded into cover image. Finally, the secret image is obtained by reverse transform of wavelet and cosine domain. The experimental results show that the watermarking is robust to the common signal processing techniques including JPEG compressing, noise, lowpass filtering and cutting.